// 字体的转换
@mixin font-dpr ($font-size) {
  font-size: $font-size;

  [data-dpr="2"] & {
    font-size: $font-size * 2;
  }

  [data-dpr="3"] & {
    font-size: $font-size * 3;
  }
}

// px转换为rem
@function px2rem ($px, $base-font-size: 64px) {
  @if unitless($px) {
    @warn "Assuming #{$px} to be in pixels, attempting to convert it into pixels for you";
    @return px2rem($px * 1px);
  }

  @else if unit($px)==rem {
    @return $px;
  }

  @return ($px / $base-font-size) * 1rem;
}
